130 research outputs found
Persistence of Vibrational Modes in a Classical Two-Dimensional Electron Liquid
Vibrational density of states of a classical two-dimensional electron system
obtained with a molecular-dynamics simulation is shown to have a peak in both
solid and liquid phases. From an exact diagonalisation of the dynamical matrix,
the peak is identified to be vibrational modes having wavelengths of the order
of the electron spacing, and the result is interpreted as persistent
vibrational modes with short wavelengths in a liquid.Comment: 4 pages, 4 figures; to be published in J. Phys.: Condensed Matte
Molecular dynamics study of a classical two-dimensional electron system: Positional and orientational orders
Molecular dynamics simulation is used to investigate the crystallization of a
classical two-dimensional electron system, in which electrons interact with the
Coulomb repulsion. From the positional and the orientational correlation
functions, we have found an indication that the solid phase has a
quasi-long-range (power-law correlated) positional order and a long-range
orientational order. This implies that the long-range 1/r system shares the
absence of the true long-range crystalline order at finite temperatures with
short-range ones for which Mermin's theorem applies. We also discuss the
existence of the ``hexatic'' phase predicted by the
Kosterlitz-Thouless-Halperin-Nelson-Young theory.Comment: 6 pages, 4 figures; contributed to EP2DS-13; revised; to be published
in Physica
Game Theoretic Approaches to Weight Assignments in Data Envelopment Analysis Problems
This paper deals with the problem of fairly allocating a certain amount of divisible goods or burdens among individuals or organizations in the multicriteria environment. It is analyzed within the framework of data envelopment analysis (DEA). We improve the game proposed by Nakabayashi and Tone (2006) and develop an alternative scheme by reassigning the total weight or power for the coalition members. The solutions and equilibria of the new DEA game proposed in this paper are also studied
Observations and Modeling of Rainfall and Sediment Runoff in the Lesti River Basin, Tributary of the Brantas River, Indonesia
Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv
Structural basis for the dual RNA-recognition modes of human Tra2-beta RRM
Human Transformer2-beta (hTra2-beta) is an important member of the serine/arginine-rich protein family, and contains one RNA recognition motif (RRM). It controls the alternative splicing of several pre-mRNAs, including those of the calcitonin/calcitonin gene-related peptide (CGRP), the survival motor neuron 1 (SMN1) protein and the tau protein. Accordingly, the RRM of hTra2-beta specifically binds to two types of RNA sequences [the CAA and (GAA)2 sequences]. We determined the solution structure of the hTra2-beta RRM (spanning residues Asn110āThr201), which not only has a canonical RRM fold, but also an unusual alignment of the aromatic amino acids on the beta-sheet surface. We then solved the complex structure of the hTra2-beta RRM with the (GAA)2 sequence, and found that the AGAA tetra-nucleotide was specifically recognized through hydrogen-bond formation with several amino acids on the N- and C-terminal extensions, as well as stacking interactions mediated by the unusually aligned aromatic rings on the beta-sheet surface. Further NMR experiments revealed that the hTra2-beta RRM recognizes the CAA sequence when it is integrated in the stem-loop structure. This study indicates that the hTra2-beta RRM recognizes two types of RNA sequences in different RNA binding modes
Crystallization of a classical two-dimensional electron system: Positional and orientational orders
Crystallization of a classical two-dimensional one-component plasma
(electrons interacting with the Coulomb repulsion in a uniform neutralizing
positive background) is investigated with a molecular dynamics simulation. The
positional and the orientational correlation functions are calculated for the
first time. We have found an indication that the solid phase has a
quasi-long-range (power-law) positional order along with a long-range
orientational order. This indicates that, although the long-range Coulomb
interaction is outside the scope of Mermin's theorem, the absence of ordinary
crystalline order at finite temperatures applies to the electron system as
well. The `hexatic' phase, which is predicted between the liquid and the solid
phases by the Kosterlitz-Thouless-Halperin-Nelson-Young theory, is also
discussed.Comment: 3 pages, 4 figures; Corrected typos; Double columne
Optimal Intravascular Ultrasound-Guided Percutaneous Coronary Intervention inĀ Patients With Multivessel Disease
BACKGROUND: Intravascular ultrasound (IVUS) was only rarely used in landmark trials comparing percutaneous coronary intervention (PCI) with coronary artery bypass grafting (CABG) in patients with multivessel disease. OBJECTIVES: The authors aimed to evaluate clinical outcomes after optimal IVUS-guided PCI in patients undergoing multivessel PCI. METHODS: The OPTIVUS (OPTimal IntraVascular UltraSound)-Complex PCI study multivessel cohort was a prospective multicenter single-arm study enrolling 1, 021 patients undergoing multivessel PCI, including left anterior descending coronary artery using IVUS, aiming to meet the prespecified criteria (OPTIVUS criteria: minimum stent area > distal reference lumen area [stent lengthĀ ā„28mm], and minimum stent area >0.8Ā Ć average reference lumen area [stent lengthĀ <28mm]) for optimal stent expansion. The primary endpoint was major adverse cardiac and cerebrovascular events (MACCE) (death/myocardial infarction/stroke/any coronary revascularization). The predefined performance goals were derived from the CREDO-Kyoto (Coronary REvascularization Demonstrating Outcome study in Kyoto) PCI/CABG registry cohort-2 fulfilling the inclusion criteria in this study. RESULTS: In this study, 40.1% of the patients met OPTIVUS criteria in all stented lesions. The cumulative 1-year incidence of the primary endpoint was 10.3% (95%Ā CI: 8.4%-12.2%), which was significantly lower than the predefined PCI performance goal of 27.5% (PĀ < 0.001), and which was numerically lower than the predefined CABG performance goal of 13.8%. The cumulative 1-year incidence of the primary endpoint was not significantly different regardless of meeting or not meeting OPTIVUS criteria. CONCLUSIONS: Contemporary PCI practice conducted in the OPTIVUS-Complex PCI study multivessel cohort was associated with a significantly lower MACCE rate than the predefined PCI performance goal, and with a numerically lower MACCE rate than the predefined CABG performance goal at 1 year
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